AMIS-42670 Datasheet, PDF (8/10 Pages) AMI SEMICONDUCTOR – High-Speed CAN Transceiver

AMIS−42670
HIGH
TxD
LOW
CANH
CANL
V_i(dif) =
V_CANH − V_CANL
0.9V
0.5V
dominant
recessive
RxD
t_{d(TxD−BUSon)}
t_{pd(rec−dom)}
0.3 x V_CC
t_{d(TxD−BUSoff)}
t_{d(BUSon−RxD)}
t _{pd(dom−rec)}
0.7 x V_CC
t_{d(BUSoff−RxD)}
PC20040829.6
Figure 6. : Timing Diagram for AC Characteristics
+5 V
100 nF
V_CC
3
TxD
7 ^CANH
1
Generator
RxD
20 pF
AMIS−
6
CANL
42670
4
8
S
5
30 W
V _REF
2
GND
6.2 kW
10 nF
Active Probe
6.2 kW
30 W
Spectrum Anayzer
47 nF
Figure 7. Basic Test Setup for Electromagnetic Measurement
PC20070831.6
CANH
CANL
V_CM =
0.5*(V_CANH+V_CANL)
V_CM−step
recessive
V_CM−peak
V_CM−peak
PC20040829.7
Figure 8. Common−Mode Voltage Peaks (See Measurement Setup Figure 7)
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